Road grader



ROAD GRADER original Filed Feb. 2, 1953 g sheets-sheet 1 F. E. ARNDTROAD GRADER Mayf-IZ, 1942,

l original Filed Feb. 2, 1933 2 Sheets-Sheet 2 man..

NVENTOR FRANKLIN E ARNm;

BY @Za/x. 7W.

A TTY Patented May 12, 1942 ROAD GRADER n Franklin E. Arndt, Galion,Ohio, assignor to The Galion Iron Works & Manufacturing Company, acorporation of Ohio Original application February 2, 1933, Serial No.

Divided and this application October 18, 1939, Serial No. 300,029

1 Claim.

My invention relates to road building apparatus and one of its objectsis the provision of improved and eicient fluid-pressure motor mechanismfor electing various adjustments in a road grading machine.

Another object of the invention is the provision of improvedduid-pressure operated mechanism for shifting the rear end of the frameof.

the road grader relatively to the rear Wheels.

Other objects of the invention will appear hereinafter, the novelfeatures and combinations being set forth in the appended claim.

This application is a division of Vmy co-pendingapplication, Serial No.654,901, led February 2, 1933, for an improvement in Road graders,Patent No. 2,247,464, granted July l, 1941.

In the accompanying drawings,

Fig. 1 is an elevation of a road grading machine embodying myimprovements;

Fig. 2 is a plan view of the structure shown in Fig. 1; and

Fig. 3 is a rear elevation of the machine shown in Fig. 1.

The machine shown in Figs. 1 and 2 comprises the vehicle frame IImounted on the front Wheels I2, I2 and the rear wheels I3, I3. The frameII comprises longitudinal spaced-apart beams I4, I4 which are rigidlyconnected by the tubular cross-,pieces I5, I6, I1 and I8.

Secured rigidly to the rear ends of the longitudinal beams I4 is a crosssupporting structure 82 (Fig. 1) comprising angle irons 83, 83 as shownin Fig. 3 and the cross-piece 84 shown in Fig. 2. Guides are provided at85, 86 for the transverse members 81, 81 of the rear Wheel supportingframe. The axles 88, 88 for the rear wheels I3, I3 are pivoted at 89, 89to the ends of the frame 81. Secured to the rear wheel axles arevertical crank arms 90, 90 the upper ends of which are pivoted at 9|, 9|to the cross-piece 92.

A vertical bracket plate 93 is secured to the frame 81 and to its upperend at 94 is pivoted a cylinder 95 of a hydraulic motor comprising apiston rod 96 the outer end of which is pivoted at 9| to the upper endof the crank arm 90 at the left-hand side of the machine as viewed fromthe rear (Fig. 3). The hydraulic motor comprising the cylinder 95 isdouble acting in that the liquid flows to and` from the cylinder 95 onboth sides of the piston therein and the controlling valve is such thatwhen it is closed the crank arms 90, 90 will be locked in adjustedpositions. The leaning of the rear Wheels may therefore be adjusted bymeans of the hydraulic motor comprising the cylinder 95 and locked inadjusted position. This mechanism for leaning the rear wheels isdescribed and claimed in my co-pending application, Ser. No. 214,599.

In order to shift the rear end of the frame II relatively to the rearWheels, a hydraulic motor comprising a cylinder 91 is pivoted at 98 to abracket 99 which is secured to the frame 81. The piston rod |00 which isconnected to the piston that moves in the cylinder 91, is pivoted at itsouter end at |0| to a gear Wheel |02 meshing with the rack bars |03 and|04. The upper rack bar |03 is secured to the machine frame and thelower rack bar |04 is secured to the frame' 81. It can readily be seenthat when the piston in the cylinder 91 is locked, the rack bars |03 and|04 are relatively stationary and therefore the gear Wheel |02 is lockedagainst rotation. The hydraulic motor comprising the cylinder 91 isdouble acting and controlled by valve mechanism so that when the pistonrod |00 is moved relatively to the cylinder 91, therear end of the mainframe I I will be shifted laterally relatively to the rear wheels I3, bythe gear |02 rolling on the rack |04 and driving the rack |03. When thepiston in the cylinder 91 is locked, the pivotal axis at I 0| will bestationary relative to the cylinder 91. The rack bars I 03 and |04 willnot interfere at any time with the operation of the rear Wheel leaningmechanism because when the vertical arms are rocked in either directionthe racks |03 and |04 will remain stationary.

Obviously those skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit andVscope of the invention as defined by the claim hereto appended, and Iwish therefore not to be restricted to the precise construction hereindisclosed.

Having thus described and shown an embodiment of my invention, what Idesire to secure by Letters Patent of the United States is:

A vehicle comprising the combination with a supporting frame adjustablealong an axletree having ground engaging supporting wheels at the endsthereof, spaced-apart rack bars one on said frame and the other on saidaxletree, a, gear meshing With said rack bars, and a reciprocating fluidpressure motor connected at oneend to said axletree and at its other endto said gear for bodily movement of the latter while said rack barseiect rotation thereof to shift laterally the rear end of said framerelatively to the said supporting wheels.

FRANKLIN E. ARNDT.

